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In order for Single Sign On to work, jTDS must be able to load the native
SPPI library (ntlmauth.dll). Place this DLL anywhere in the system path
(defined by the PATH system variable) and you're all set.

Once you have used the DBVisualizer "Driver Finder" you need to place the correct sqljdbc_auth.dll (x86 vs x64) in the jre/bin directory used by DBVisualizer. In my case I use the 64 bit DBVisualizer with an embedded jre. so my directory is: